问题
My doubt is that - a port is just logical, so why such restriction ? Why can't I have a port of 9924593 or something like that ?
回答1:
Look at the packet format for the TCP segment. The port identifiers are unsigned 16-bit integers, meaning that the largest number you can put in there is 216-1 = 65535.
来源：https://stackoverflow.com/questions/36796183/why-is-the-maximum-port-range-65535-in-the-tcp-ip-suite